Shaanxi BLOOM Tech Co., Ltd. is one of the most experienced manufacturers and suppliers of 1-hydroxyethylidene-1,1-diphosphonic acid cas 2809-21-4 in China. Welcome to wholesale bulk high quality 1-hydroxyethylidene-1,1-diphosphonic acid cas 2809-21-4 for sale here from our factory. Good service and reasonable price are available.
1-Hydroxyethylidene-1,1-diphosphonic acid is an organic compound with the molecular formula of C2H8O7P2, CAS 2809-21-4, white crystalline particles, and the dissolved water is colorless to yellowish liquid. This product is easily soluble in water, methanol and ethanol. It has a large dissociation constant in water and can form stable complexes with metal ions. It can form stable adducts with compounds containing active oxygen to keep active oxygen stable. Low toxicity. The appearance shape is still stable at high PH value, which is not easy to hydrolyze and does not react with the enzyme in the receptor. It is low toxic and easy to be discharged from the body. It can play a good role at 200 ℃, decompose above 250, and is acid and alkali resistant. It can form stable complexes with iron, copper, aluminum, zinc and other metal ions. It is mainly used as scale inhibitor and corrosion inhibitor for boiler and heat exchanger, complexing agent for cyanide free electroplating, chelating agent for soap, and cleaning agent for metal and non-metal.
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Chemical Formula |
C2H8O7P2 |
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Exact Mass |
206 |
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Molecular Weight |
206 |
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m/z |
206 (100.0%), 207 (2.2%), 208 (1.2%) |
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Elemental Analysis |
C, 11.66; H, 3.91; O, 54.36; P, 30.07 |
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1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP), as a highly efficient organic phosphonic acid compound, exhibits excellent chelating, scale inhibition, corrosion inhibition, and dispersion properties due to its unique molecular structure (containing two phosphonic acid groups and one hydroxyethyl group). Its application areas cover multiple industries such as industrial water treatment, electroplating, textile, agriculture, daily chemical, environmental protection, and medicine, making it an indispensable functional chemical in modern industry and life.
HEDP occupies a dominant position in the field of industrial water treatment, with its application accounting for over 60%. It mainly serves the circulating cooling water system and boiler water treatment in industries such as power, chemical, metallurgy, and fertilizer.
Scale inhibition mechanism
HEDP chelates hardness ions such as calcium and magnesium in water to form stable six membered ring chelates, which inhibit ion crystallization deposition. Its critical chelating concentration is as low as 2mg/L, which can effectively prevent the formation of scale such as calcium carbonate and calcium sulfate. Experiments have shown that adding 5mg/L HEDP to the circulating cooling water system can increase the heat transfer efficiency of the heat exchanger by 15% and extend the equipment life by 3-5 years.
Corrosion inhibition performance
HEDP forms a dense oxide film on the metal surface, with an anodic polarization impedance value of 10 Ω· cm ², significantly slowing down the corrosion rate.
Adding 20mg/L HEDP to the water of medium and low pressure boilers can reduce the corrosion rate of carbon steel by 80% and save maintenance costs by over 30% annually.
Synergy effect
When HEDP is used in combination with polycarboxylate based scale inhibitors and dispersants (such as PAA), the scale inhibition rate can be increased by 15% -30%. For example, in oilfield water injection pipelines, the combination of 20-100mg/L HEDP and ATMP can reduce scaling thickness by more than 50%.
Extreme environmental adaptability
HEDP remains stable under extreme conditions of 250 ℃ high temperature and pH>14, with excellent resistance to chlorine oxidation (corrosion inhibition efficiency does not decrease when free chlorine concentration is ≤ 5mg/L), and is suitable for the treatment of high salt and high hardness industrial wastewater.
HEDP, as the core chelating agent for cyanide free electroplating, promotes the transformation of the electroplating industry towards environmental protection.
Chelation stabilization effect
HEDP can stabilize metal ions (such as copper, zinc, nickel) and improve the stability of electroplating solutions. In zinc nickel alloy electroplating, adding 15g/L HEDP can increase the adhesion of the coating by 20% and reduce the porosity to below 0.5/cm ².
Corrosion inhibition protection
HEDP forms a protective film during the electroplating process to prevent substrate corrosion. Experiments have shown that adding 10g/L HEDP to acidic copper plating solution can reduce the corrosion rate of steel substrates by 90% and significantly improve the uniformity of the coating.
Environmentally friendly alternatives
HEDP replaces traditional cyanide chelating agents to reduce the emission of highly toxic substances. After adopting the HEDP cyanide free electroplating process, a certain electronics factory reduced the cost of wastewater treatment by 60% and significantly reduced the health risks for employees.
Textile Printing and Dyeing: Empowerors of Color Technology
The application of HEDP in the textile industry runs through the entire process of pre-treatment, dyeing, and finishing, improving product quality and production efficiency.
Peroxide Stabilizer
HEDP can inhibit the ineffective decomposition of hydrogen peroxide and improve bleaching efficiency. Adding 2g/L HEDP to cotton fabric bleaching can increase whiteness by 10% and reduce strength loss by 15%.
dyeing assistant
HEDP improves dye dispersibility and prevents discoloration. Adding 1.5g/L HEDP to reactive dye dyeing can increase the dye uptake by 8% and improve color fastness by 0.5 levels.
Wash and prevent scaling
HEDP chelates calcium and magnesium ions in hard water to prevent detergent failure. Adding 3% HEDP to industrial detergents can increase the cleaning power by 25% and extend the equipment scaling cycle to more than 6 months.
HEDP contributes to the sustainable development of modern agriculture by chelating nutrients and regulating plant physiology.
fertilizer synergist
HEDP forms stable complexes with trace elements to improve nutrient utilization efficiency. Adding 0.5% HEDP to foliar fertilizer can increase the absorption rate of trace elements such as zinc and iron by 30%, and increase crop yield by 10% -15%.
Soil conditioner
HEDP chelates heavy metal ions in soil to reduce toxicity. The application of HEDP containing amendments in heavy metal contaminated farmland can reduce the cadmium content in rice to below 0.2mg/kg, meeting national safety standards.
plant growth regulation
HEDP enhances crop stress resistance. Under drought stress, spraying a solution containing 0.1% HEDP can increase the survival rate of maize by 20% and the photosynthetic efficiency by 15%.
Daily Chemicals: Creators of Quality Life
HEDP plays a multifunctional role in daily chemical products, enhancing user experience and product performance.
Detergent additive
HEDP chelates hard water ions to prevent soap scale formation. Adding 2% HEDP to laundry detergent can increase stain removal power by 20% and improve clothing whiteness retention by 30%.
Personal care products
HEDP acts as a pH regulator and chelating agent to stabilize product formulations. Adding 0.5% HEDP to shampoo can increase the fineness of foam by 15% and the dandruff removal effect by 25%.
Hard surface cleaning
1-Hydroxyethylidene-1,1-diphosphonic acid removes rust and scale from metal and ceramic surfaces. Adding 5% HEDP to kitchen cleaners can increase cleaning efficiency by 40% and is non corrosive to stainless steel.
HEDP demonstrates environmental value in wastewater treatment and soil remediation, promoting the development of circular economy.
Heavy metal wastewater treatment
HEDP chelates heavy metals such as lead and cadmium in wastewater to form precipitable complexes. In the treatment of electroplating wastewater, adding 100mg/L HEDP can reduce the concentration of heavy metal ions to below 0.1mg/L, meeting the discharge standards.
Sludge resource utilization
HEDP improves sludge dewatering performance and promotes resource utilization. Adding 0.2% HEDP to municipal sludge treatment can reduce the sludge moisture content from 85% to 65% and decrease the volume by 40%.
Soil remediation
HEDP stabilizes heavy metals in soil and reduces their mobility. The application of HEDP containing solidifier in soil remediation in mining areas can reduce the leaching toxicity of lead and zinc by 80%, and restore vegetation coverage to over 70%.
Medical field: explorer of health technology
The application of HEDP in the pharmaceutical industry continues to expand, from traditional bone disease treatment to new anti-cancer research, demonstrating biomedical potential.
Bone metabolism regulator
HEDP inhibits osteoclast activity and reduces bone resorption. Clinical studies have shown that intravenous injection of HEDP can increase bone density by 3% -5% and reduce fracture risk by 40% in patients with osteoporosis.
Anti-cancer drug carrier
HEDP, as a bisphosphonate drug, can target and bind to bone tissue for the treatment of bone metastatic cancer. In the treatment of bone metastasis of breast cancer, HEDP combined with chemotherapy can increase the pain relief rate to 75% and prolong the survival period by 6-8 months.
Radioactive nuclide carrier
HEDP forms stable complexes with isotopes such as strontium-89 for the treatment of bone pain. In the treatment of prostate cancer bone metastasis, HEDP labeled strontium-89 can reduce pain scores by more than 50% and significantly improve quality of life.
With the advancement of technology, the application of HEDP in emerging fields such as new energy and electronic materials is gradually emerging.
Lithium battery electrolyte additive
HEDP, as a film-forming additive, improves the cycling stability of lithium-ion batteries. Experiments have shown that adding 1% HEDP electrolyte can increase battery cycle life by 20% and capacity retention rate by over 90%.
Electronic cleaning agent
HEDP removes oxides and stains from the surface of electronic components, improving welding quality. In semiconductor cleaning, using cleaning solutions containing HEDP can increase the yield rate to 99.5% and reduce the failure rate to below 0.01%.
3D printing materials
HEDP, as a crosslinking agent for photocurable resins, improves printing accuracy. In dental model printing, adding 2% HEDP can achieve a dimensional accuracy of ± 0.05mm and reduce surface roughness to Ra0.8 μ m.
Generally, glacial acetic acid reacts with phosphorus trichloride in industry, and then the acylation product is condensed with the hydrolysis product of phosphorus trichloride. Add metered water and glacial acetic acid into the reactor and stir evenly. Add phosphorus trichloride drop under cooling, and control the reaction temperature at 40~80 ℃. The by-product hydrogen chloride gas is condensed and sent to the absorption tower to recover hydrochloric acid. The overflowing acetyl chloride and acetic acid return to the reactor after condensation. After dropping phosphorus trichloride, raise the temperature to 100~130 ℃ and reflux for 4~5h. After the reaction, the residual acetic acid and low boiling point substances are evaporated by steam hydrolysis. Get products.
The product is obtained by nucleophilic addition of diethylenetriamine and formaldehyde, esterification of the addition product with the hydrolysis product of phosphorus trichloride, and neutralization. See EDTMP for details.
It is prepared by mixing phosphorus trichloride and glacial acetic acid, heating and distillation to obtain acetyl chloride (see 00510), and then reacting with phosphoric acid. The commercially available product is a viscous liquid diluted with water with a content of 50%. Each ton of product consumes 931kg of phosphorus trichloride (95%) and 591kg of glacial acetic acid.
1-Hydroxyethylidene-1,1-diphosphonic acid is an organic phosphoric acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions, and can dissolve oxides on metal surfaces. HEDP can still play a good role of corrosion and scale inhibition at 250 ℃. It is still stable at high pH value and is not easy to hydrolyze. It is not easy to decompose under general photothermal conditions. Acid and alkali resistance and chlorine oxidation resistance are better than other organic phosphoric acid (salts). HEDP can form six ring chelates with metal ions in water, especially calcium ions, so HEDP has good scale inhibition effect and obvious solution limit effect. When used together with other water treatment agents, HEDP shows ideal synergistic effect.
HEDP solid is a high-purity product, which is suitable for winter cold regions; It is especially suitable for cleaning agents and daily chemical additives in the electronic industry.
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